Follow Our FB Page << CircleMedia.in >> for Daily Laughter. We Post Funny, Viral, Comedy Videos, Memes, Vines...

Core Java Interview Questions
Questions Answers Views Company eMail

my method "abc" return array of interface "xyz" and "pqr" is abstract class implements abc and class "jkl" extends pqr My problem 1) when i call abc it retrun array xyz how can i do this hint xyz refer_xyz = new jkl(); but i can't create array. 2)I want to access method of jkl using reference of xyz??

1 2741

why interaction with server using javascript is difficult

1 2830

StringBuilder s = new StringBuilder("Hello Mom");s.append(",I mean,Mother"); Response.Write(s.ToString()); String s = "Hello Mom"; s+ = ",I mean Mom"; Response.Write(s); Which is faster ? which uses the most memory?

HCL,

6 6413

I have one Shopping cart application, i that i have selected some items, while clicking submit button by mistake i have clicked twice or trice, that time items are selected twice or trice. Actually i want only one copy of items but its selected twice or trice. So how can we avoid this problem?

Honeywell,

2 5410

How Vector class is synchronized,How to build user defined class as synchronized?

1332

What is difference between abstract class & final class

7 24118

Hai all I want to print given array in reverse order Ex: int a[]={1,2,3,4,5};display this array in reverse order.

4 4373

what is the output ? Math.floor(-2.1) a)2 b)-2 c)-3.0 d)0

Accenture,

4 11794

How to find the size of an array a)array.length() b)array.length c)array.size() d)array.size

Accenture,

6 8171

what is the Yield() method used in threads?

Accenture,

4 6195

System.out.println(101/14) what is the output? a)6 b)14 c)7.14 d)0

Accenture,

8 7551

when a servlet sends request for first time it uses the follwing methods a)init b)doget() c)dopost() d)service

Accenture,

4 5588

What is Hash Code in Java?

Cognizant,

6 13349

What are uses of Hash Code?

Cognizant,

2 6046

I have 100 records in a table with two rows. I need to display 10 records per page like Google Search. I need only the Logic(Pagination) in Pure Java. No JSP and all..Thanks in Advance...

Cybernet,

2 6612


Post New Core Java Questions

Un-Answered Questions { Core Java }

How are destructors defined in java?

381


which one is more efficient int x; 1. if(x==null) 2.if(null==x) state which one either 1 or 2?

8420


What is anagram of a string?

360


Why is the main method declared static?

410


What is locale in java?

410






What do you mean by thread safe?

351


What does opcode mean?

362


Is jdk required on each machine to run a java program?

541


Explain java coding standards for interfaces?

457


How can we use primitive data types as objects?

404


What is a treeset in java?

401


What 5 doubled?

365


What is the purpose of the main method?

399


what do you mean by stream pipelining in java 8? Explain

368


Can a string be null?

379